Double twisting machine



Nov. 12, 1968 Y K. NIMTZ ETAL 3,410,072

DOUBLE TWISTING MACHINE Filed May l5, 1967 6 Sheets-Sheet 1 [WFM-ORS Nov. l2, 1968 K. NlMTz ETAL 3,410,072

DOUBLE TWISTING MACHINE Filed May 15, 1967 6 Sheets-Sheet 2 /IYVEIYTOR 5 Nov. 12, 1968 K. NIMTz ETAL DOUBLE TWISTING MACHINE 6 Sheets-Sheet 3 Filed May l5, 1967 IIIIIIIIII,

Nov. 12, 1968 K. NlMTz ETAL DOUBLE TWISTING MACHINE 6 Sheets-Sheet 4 Filed May l5, 1967 m/VE/Vons 6 (/.s/ar Franza n Nov. 12, 1968 K. NIMTZ ETAL 3,410,072

DOUBLE TWISTING MACHINE Filed May l5, 1967 6 Sheets-Sheet 5 60s/ar /v-o z e n NOV- 12, 1968 K. NIMTz ETAL DOUBL TWISTING MACHINE 6 Sheets-Sheet 6 Filed May 15, 1967 IN VEN TOR 5 790.5 /f//z @47%,

United States Patent G 3,410,072 DOUBLE TWISTING MACHINE Klaus Nimtz and Gustav Franzen, Krefeld, Germany, assignors to Palitex Project-Company GmbH, Krefeld, Germany Filed May 15, 1967, Ser. No. 638,507 Claims priority, application Germany, May 16, 1966, P 39,453 Claims. (Cl. 57-58.83)

ABSTRACT OF THE DISCLOSURE The present invention relates to a two-for-one twisting machine with a plurality of twisting spindles respectively having thread balloon forming means associated therewith, which is characterized primarily by annular singeing means respectively associated with said spindles and arranged relative to said thread balloon forming means in such a way as to be located in the vicinity of the zenith area of the thread balloon being formed by said thread balloon forming means.

The present invention relates to a double twisting machine. With various types of yarn, there exists the requirement that the yarn prior to being further processed being subjected to a singeing operation in order to eliminate protruding ber tips or the like by singeing so as to obtain a uniform smooth surface of the yarn. Heretofore, this singeing requires an additional rewinding of the yarn in so-called yarn singeing machines in which the yarn at a relatively high speed of above 150 yards per minute is passed by a singeing device which with open llames or by means of electric heating sur-faces singes oI the protruding liber tips.

According to a somewhat older arrangement for use in connection with double twisting machines the singeing is elected during the twisting operation, to which end each spindle on the twisting path of the thread from the delivering bobbin to the winding-up bobbin has associated therewith, a singeing device for singeing olf liber tips protruding vfrom the thread, so that the thread and that section of the singeing device which faces said thread move relative to each other in a crossing or opposite direction. The relative movement of the thread and the singeing device brings about that the yarn passes at high speed by the open ames or by the electrically heated surfaces whereby the liber tips are singed off while a burning of the thread will be avoided.

Based on this older suggestion, it is an object of the present invention so to design and locate the singeing device with regard to the thread path as to greatly improve and simplify the singeing system.

It is another object of this invention to provide `and arrange a singeing device of the type set forth in the preceding paragraph which will permit withdrawal of the singed residues directly from the area where they occur.

These and other objects and advantages of the invention will appear more clearly from the following specication in connection with the accompanying drawings, in which:

FIGURE 1 illustrates a singeing device according to the present invention, which is designed as -a thread guiding eye and located in the zenith point of the balloon being described -by the thread, said singeing device being provided with a protective sleeve and a -following running ahead roller of a two-for-one twisting spindle.

FIGURE 1a is a view of a bushing receiving the protective sleeve.

3,410,072 Patented Nov. l2, 1968 FIGURE 2 is an annular singeing device arranged at the free end of a tiltable arm extending into the area of the zenith point of the thread balloon and simultaneously carrying a protective sleeve as thread guiding means, said singeing device being followed by a running ahead roller.

FIGURE 3 shows the singeing device with thread guiding eye of FIG. 2 in side view.

FIGURE 4 is a section along the yline IV-IV of FIGS. 3 and 6, but on a larger scale than the latter.

FIGURE 5 illustrates on a larger scale than FIG. 3, a partial section perpendicular to the cutting plane along the line IV-IV of FIG. 3.

FIGURE 6 represents the singeing device according to FIGS. 2 to 5 with means `for adjusting said device as to height.

FIGURE 7 is a gas heated singeing device with a protective sleeve, with a preceding thread guiding eye and With a succeeding running ahead roller.

FIGURE 8 is a horizontal section through a singeing device in the form of a unilaterally open ring at the free end of an axially extendable suction conduit.

FIGURE 9 is a horizontal section of a singeing device designed as a foldable ring and arranged at the free end of a suction conduit.

FIGURE 10 is a section through a singeing device in the lform of an electrically heated slotted hollow cylinder arranged above the threaded guiding eye in the slotted hood body at the free end of a suction conduit; FIG. 10 also showing the operation of inserting the thread.

FIGURE 10a is a top view of the hood body shown in FIG. 10.

FIGURE 11 shows a section through a singeing device at the free end of a suction conduit with a thread guiding eye in the -form of a heated spiral with inserted protective sleeve.

FIGURE 12 shows in section, the arrangement of an annular gas heating device for a two-for-one twisting spindle with interior winding.

FIGURE 12a shows a front view of FIGURE 12 t0- gether with a lap Ifrom which the thread is withdrawn and the guiding elements between said lap and the twofor-one twisting spindle of FIGURE 12.

FIGURE 13 is a section through the two-for-one twisting spindle of FIG. 12, said section being taken along the line XIII-XIII of FIG. 12.

The present invention is characterized primarily in that the singeing device respectively associated with one of the spindles of the machine is arranged within the zentih area of the balloon described by the circulating thread, said singeing device surrounding the thread at said zenith area. Such an arrangement brings about that the singeing device extends around the balloon-shaped rotating thread not within the area of a relatively widely outwardly swinging thread Aballoon section, but within the area of the thread path where the radial swinging out of the thread is reduced to a minimum.

The present invention can be realized with all types of two-for-one twisting spindles, namely, with those employing a delivery bobbin and also with those having an internal winding-up arrangement, in other words, which carry the winding-up bobbin.

According to a further development of the present invention, the thread guiding eye at the zenith point of the thread balloon may be designed as a singeing device so that at this point the thread will swing radially outwardly only by the inner radius yof the thread guiding eye. In this connection, it is of particular advantage that the function of the thread guiding eye and the function of the singeing device are combined in a single structural body whereby the overall construction of a double twisting machine with singeing devices is considerably simplified and the exchange of the singeing device, for instance for purposes of exchanging the heating elements will be greatly facilitated.

Instead of designing the thread guiding eye directly as a singeing device, it is also possible according to a further feature of the present invention to arrange the singeing device directly above or below the thread guiding eye in the zenith point of the thread balloon so that the singeing device may be combined with the thread guiding eye in a single structural unit which, however, the thread balloon will, within the area of the singeing device, be able to swing out further than Within the thread guiding eye, which, in turn, permits an increase in the speed at which the thread may pass by the singeing device while circulating and moving in the withdrawal direction.

According to a still further feature of the invention, the singeing device may be designed in the form of an axially extending unfoldable or slotted cylindrical body which extends directly above the thread lguiding eye. Such an arrangement brings about that the cylindrical singeing device will limit the balloon-shaped outward swinging of the thread above the thread guiding eye while forcing the thread to stay within the effective range of the singeing device over a length corresponding to the length of said cylinder.

According to still another embodiment of the present invention, it is :possible to so arrange the singeing device that the latter in the form of a spiral will extend around the thread within the area of the zenith point of the balloon thereby creating the provision that the inner contour of the singeing device within the area of the zenith point of the thread balloon will correspond approximately to the contour of the thread balloon within the range of the zenith point of the balloon.

Particularly when the singeing device extends around the thread in the form of a closed ring, the threading of the thread may cause difliculties when the singeing device is already heated up and would burn a thread which has not yet been moved through in the longitudinal direction thereof. While with a unilaterally open singeing device, there exists the possibility to insert the thread when the spindle begins to rotate, it is necessary to effect the threading in a singeing device forming a closed ring, at an earlier stage.

In order to make this possible, it is provided according to the invention that a protective sleeve surrounding the thread and permitting the passage `of the latter therethrough is axially insertable into the singeing device so that the thread will not come into the effective range of the heated surfaces or the open flames thereof prior to the start of the winding-up operation.

More specifically, the protective sleeve may be held and guided in the hood-shaped body at the free end of the tiltable arm in such a way that by axial displacement the protective sleeve will be able to move into the singeing device so as to cover the thread all the way around against the inuence of the singeing device. By displacing the protective sleeve in the opposite direction, the singeing device is exposed and now `can be effective on the thread being passed therethrough.

Referring now to the drawings in detail, and FIG. l thereof in particular, it will be noted that within the range of the zenith point 11 0f the balloon formed by the circulating thread 1, there is provided the free hoodshaped end of a suction pipe 2 in which there is arranged an annular electrically heated singeing device 3 which receives its current through the cable 4. The annular singeing device 3 simultaneously forms the thread guiding eye into which the thread 1 enters from below through the opening 5 in the hood-shaped end of the suction pipe 2 and then continues upwardly. The thread 1 then passes to a running ahead roller 7 on a running ahead shaft 8 and continues in a non-illustrated manner 4 to the winding-up bobbin. The roller 7 is shown in FIG. l offset by 90.

According to FIG. l, a protective sleeve 73 is inserted from above into the annular singeing device 3. Protective sleeve 73 is guided and supported by a bushing 72 which is inserted into the free end of the suction pipe 2 coaxially with regard to the singeing device 3 and rests by means of flange 74 on said suction pipe 2. Bushing 72 has a lateral longitudinal slot 75 through which radially extends a handle 76 connected to the protective sleeve 73. By means of the said handle the protective sleeve 73 can be lifted out of the singeing device 3 until the handle 76 extends over the upper edge of bushing 72. By turning the bushing about its axis by the handle 76 can engage a recess 77 in the upper edge of bushing 72 so that the protective sleeve 73 will be held in the position indicated by dot-dash lines. In this way, the thread 1, as described above can come into effective contact with the singeing device. In the illustrated solid position 0f the protective sleeve 73 it is possible to thread the thread 1 while the spindle is at a standstill, without exposing the thread to a singeing operation which with the thread at a standstill could otherwise cause the burning of the thread. Simultaneously, with the start of the rotation of the spindle and the Winding-up of the thread onto the winding-up bobbn 7 the protective sleeve 73 is withdrawn from the annular singeing device 3.

In view of the fact that the thread on one hand moves in upward direction in conformity with the winding-up speed, and on the other handwithin the singeing device 3 carries out a circulatory movement, it will be appreciated that the thread will for only a very short period be exposed to the singeing effect exerted by the inner surface of the annular singeing device 3 during which protruding fiber tips will be singed off.

According to FIG. 2, a singeing device 3a of somewhat larger diameter than the singeing device 3 of FIG. 1, forms an electrically heated singeing device arranged in the hood-shaped free end of the suction pipe 2. Above said singeing device 3a there is provided a thread guiding eye in the form of a protective sleeve 73 which is adapted axially to be introduced into said singeing device 3a, said protective sleeve 73 being freely displaceable in the bushing 72 supported by the arrn 10 connected to the suction pipe 2. When the protective sleeve 73 is in its lowered position, it surrounds the thread 1 within the singeing device 3a so that the heat thereof cannot affect the thread 1, and thus will, in the lowered position of said protective sleeve 73 and at the standstill of the spindle or the balloon permit a safe threading of the thread 1. The lowered position of the protective sleeve 73 is indicated by dot-dash lines. The lifting of the protective sleeve 73 is effected automatically by the thread 1 when the latter during the starting of the spindle forms the balloon. In this instance, the protective sleeve 73 forms, so to speak, a floating sleeve supported by the rotating thread 1.

FIG. 3 shows the singeing device according to FIG. 1 in view but with the protective sleeve 73 in elevated position and turned by 90. As will be evident from FIG. 3, the suction pipe 2 forms a hollow pivotable arm which is pivotable toward the side about the pivot 14 which latter is formed by a screw with head 13 and nut 12. Said pivot 14 extends through the connecting end 15 of suction pipe 2 and the connecting end 16 leading to the suction conduit 18. The connecting end 16 is by means of a ange 17 connected to the suction conduit 18 which may extend for instance alongside the machine.

Also in this instance the thread guiding eye and the singeing device form a structural unit receiving the elements for the current and gas supply and withdrawing the burned residues. By employing a pivotable arm, it will be possible to swing the singeing device out of the path of the thread whereby the threading of the thread will be facilitated and also the unimpeded exchange and replacement of a bobbin.

The operative position of the suction pipe 2 with singeing device and thread guiding eye 9 is adjustable by a ball arresting device or the like as shown in FIG. 5. In the wall of the connecting member there is provided a ball 19 which is continuously under the inuence of a spring 20 and tends to urge said ball 119 against the upper marginal surface of the connecting member 16 and into the recess 16.

By laterally moving the arm 2, the ball portion 211 (FIG. 4) disengages the recess 16 so as to permit a tilting over an angle of 90 as is clearly indicated by the surface 22 in FIG. 4.

With the arrangement shown in FIG. 6, the suction pipe 2 is likewise pivotably connected to the connecting member 16a to which 4is connected the vertical pipe 22 which is vertically displaceable and telescopically engages the suction pipe 24 leading into a suction conduit 18. The connecting member 16a is by means of a clamp 25 connected to a bar 26 extending alongside the machine, said bar 26 being adjustable as to height so that the suction pipe 2 with the singeing device arranged at the free end thereof and the thread guiding eye 9 can be adjusted as to height without interrupting the connection with the suction pipe 24.

The embodiment of FIG. 7 shows a suction pipe 2 with a funnel-shaped free end 27 the thread inlet opening of which is formed by a thread guiding eye 9. Above said thread guiding eye 9 there is provided the singeing device 29 in the form of a ring having connected thereto a gas supply line 30. Ring 29 is provided with downwardly directed nozzles 31 which converge toward each other and from which the gas escapes so that the flames pass along the thread 1 in a direction opposite to the direction of movement of the thread and, more specifically, directly above the zenith point 11 of the thread balloon.

Similar to the preceding embodiments, after passing the singeing device 29, the thread 1 moves over a running ahead roller 7 and from the latter to a winding up bobbin not shown in the drawing. Similar to the embodiment illustrated in FIG. l, there is provided a protective sleeve 73 which is axially displaceable in a bushing 72. In the position shown in solid lines in FIG. 7, the protective sleeve 73 is pulled out of the singeing device 29 while the dot-dash lines in FIG. 7 show the protective sleeve 73 extending through the singeing device 29. The upward and downward movement of the protective sleeve 73 is effected by handle 76.

FIG. 8 diagrammatically illustrates a telescopically movable suction pipe 2 which is longitudinally displaceable in the connecting pipe 32. Suction pipe 2 widens toward the free end so as to form a hood in a manner similar to FIG. 7 and forms a unilaterally open ring which forms an electrically or gas heated suction device 33.

According to FIG. 9, the free end of the suction pipe 2 which widens toward the hood 28 has pivotably linked thereto by means of a pivot 35 the singeing device 34 which is formed by two sections adapted to be pivoted away from each other. The section 36 carries the handle 37 for opening the singeing device to permit radial insertion of the thread 1. The pivotal connection by means of pins 35 is such that in View of the provision of intermeshing teeth 38, the outward turning of the section 36 will automatically force the other section 39 to move correspondingly outwardly. The reverse condition and operation will, of course, prevail when the handle 37 swings the section 36 inwardly so that in closed position the singeing device forms a closed ring. Also in this instance the singeing device composed of two sections may be heated by gas or electrically. The two heating rings in FIG. 9 are designated with the reference numeral 40.

FIG. l0 shows a suction pipe 2 the free end of which is broadened and has a vertical central slot 78. The hoodshaped widened portion 41 has a thread exit opening 6, whereas a thread guiding eye 9 forms the thread inlet opening. Between said openings 6 and 9 in the interior of said widened hood-shaped portion 41 there is arranged a hollow cylindrical electrically heated singeing device 42 which in conformity with the hood-shaped portion 41 is correspondingly slotted and connected to the electric cable 4. The singeing device thus acts directly above the thread guiding eye 9 in that range in which the thread 1 within the singeing device 42 forms a slightly radially outwardly swinging balloon. The slot 78 makes possible the radial insertion of the thread 1 into the singeing device as shown in FIG. l0.

In conformity with FIG. l1, in hood 41 at the free end of the suction pipe 2 there is provided a spirally shaped electrically heated singeing device 43 with which the thread 1 on its balloon-shaped circulatory path will come into contact in the larea of the zenith point of the ballon. As a result thereof the inner contour of the singeing device within the zenith point of the thread balloon can correspond to approximately the contour of the thread balloon Within the range of the zenith point of the balloon.

The zenith point of the balloon is determined by the protective sleeve 73 with handle 76 arranged in a manner similar to that of FIG. 1. The protective sleeve 73 is held in bushing 72 and is displaceable therein as indicated by dot-dash lines. In this instance bushing 72 forms one piece with the hood-shaped broadened portion 41.

FIGS. 12 and 13 show sections through a two-for-one twisting spindle with so-called interior winding up. With this type of two-for-one spindle, a plurality of threads are together from delivery bobbins (not shown) arranged on a cree axially from below (see arrow 44) introduced into a spindle rotor 45 driven by a tangential belt 49 from where the already twisted threads laterally pass through the thread storage disc 46. The thread 1 while swinging out radially so as to form a balloon will then pass upwardly and is deviated in downward direction in the cylindrical thread guiding member 47. The thread guiding member 47 is supported by an arm 48 which is connected to a protective ring 58 mounted on a frame 53. A cylindrical balloon restrainer 60 with holding magnets 61 extends around the protective ring 58. The holding magnets 61 have associated therewith holding magnets 62 mounted on the protective ring 58 whereby the frame 53 is prevented from turning together with the spindle rotor 45 with the thread storage disc 46. The balloon restrainer 60 is by means of a column 67 connected to the spindle rail 68.

On its balloon-shaped path between the thread storage disc 46 and the thread guiding member 47, the thread directly prior to entering the thread guiding member 47 passes the singeing device in the form of a gas heated ring 29 so that the thread 1 similar to the situation with the arrangement of FIG. 7 is subjected to a singeing eiect. The gas heated ring 29 is supported by a gas feeding pipe 65 which is pivotally connected at 64 to a supporting pipe 66 so as to be able to be tilted upwardly. The supporting pipe 66 serves as supply pipe for the heating gas.

After the thread 1 has passed the thread guiding member 47, it is by means of a deviating member 50 conveyed to the traversing roller 51 provided with guiding grooves crossing each other. The thread partially passes around said roller 51 and is then wound onto the winding-up bobbin 52 the axis of which is horizontally located. The winding-up bobbin 52 is journalled in a frame 53 which is non-rotatable relative to the spindle rotor 45 and is driven by the traversing roller 51 on which it rests freely displaceably.

The roller 51 is driven by the spindle rotor 45, 46, the pinion 54 rotating therewith, the wheel 54a ljournalled in frame 53 and the coaxially arranged pulley 55 which has partially looped therearound a belt 56 which latter after passing over the two reversing discs 57 and 58 passes over the roller 51 and thus rotates the same.

The gas heated ring 29 may, of course, also be replaced by singeing devices of the type described above with the other embodiments.

As will be evident from the above, a singeing device according to the present invention may be employed with various types of two-for-one twisting spindles. The twisted thread will always directly within the range of the zenith point of the thread balloon pass by the singeing device not only in the longitudinal direction of the thread balloon but also transverse thereto so that singeing conditions are realized as they are encountered with singeing machines according to which the thread passes by the singeing device in the longitudinal direction of the thread only and at extremely high speeds.

It is, of course, to be understood that the present invention is, by no means limited to the particular embodiments shown in the drawings but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. In a two-for-one twisting machine with a plurality of twisting spindles respectively having thread balloon forming means associated therewith: annular singeing means respectively associated with said spindles and arranged relative to said thread balloon forming means so as to be in the vincinity of the zenith area of the thread balloon to be formed by said thread balloon forming means.

2. A machine according to claim 1, in which said singeing means simultaneously form a thread guiding eye for the respective thread portions leaving the path of the balloon.

3. A machine according to claim 1, in which said annular singeing means have a unilaterally arranged opening.

4. A machine according to claim 1, in which said singeing means is formed by an electrically heated annular body.

5. A machine according to claim 1, in which said annular singeing means is formed by a gas heated annular body with gas nozzles evenly distributed therearound, the axes of said gas nozzles defining the contour of a cone With the tip thereof pointing toward said balloon forming means.

6. A machine according to claim 1, in which said annular singeing means comprises two sections hingedly connected to each other for selectively opening and closing said annular singeing means.

7. A machine according to claim 1, which includes a thread guiding eye substantially coaxially arranged with regard to and in the vicinity of said singeing means.

8, A machine according to claim 1, which includes: housing means surrounding said singeing means, and suction conduit means communicating with said housing means for withdrawing singed oi fiber tips.

9. A machine according to claim 8, in which said suction conduit means together with said housing means and said singeing means is pivotable in a horizontal plane.

10. A machine according to claim 8, in which said suction conduit means together with said housing means and said singeing means is adjustable in vertical direction.

11. A machine according to claim 1, which includes a protective sleeve substantially coaxial with said annular singeing means and movable selectively into and out of the inner conne of said annular singeing means.

12. A machine according to claim 8, which includes a protective sleeve substantially coaxial with said annular singeing means and adjustably mounted in said housing means for selectively locating a portion of said sleeve in and out of the inner confine of said annular singeing means.

13. A machine according to claim 8, which includes a protective sleeve substantially coaxial with said annular singeing means and slidably and oatingly suspended by a portion of said housing means, said sleeve at the standstill of said spindles having a portion thereof within the annular conne of said singeing means and being movable out of said confine by the balloon being formed by said balloon forming means during the operation of said spindles.

14. A machine according to claim 8, in which said housing means and said singeing means are unilaterally slotted, the slot of said housing means and the slot of said singeing means being located at one and the same side and in alignment with each other while extending in vertical direction.

15. A machine according to claim 1, in which said annular singeing means is formed by a spiral.

References Cited UNITED STATES PATENTS 875,711 1/1908 Higginson 28-63 1,665,970 4/1928 Mettler 28-63 1,669,033 5/1928 Muller et al 28-63 3,093,955 6/ 1963 Cadario 57-34 FOREIGN PATENTS 646,749 8/ 1962 Canada.

FRANK J. COHEN, Primary Examiner.

W. H. SCHROEDER, Assistant Examiner. 

